<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>混合布局</title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			div{
				text-align: center;
				font-size: 20px;
				font-weight: bolder;
			}
			#top{
				width: 100%;
				height: 50px;
				background-color: gainsboro;
			}
			#content{
				width: 1200px;
				height: 600px;
				margin: 20px auto 15px;   /*内容区域居中显示,上外边距为20px,下外边距为15px*/
				background-color: cornflowerblue;
			}
			#content .common{
				height: 560px;
				float: left;
				background-color: white;
			}
			#content .left{
				width: 200px;
				margin: 20px 10px 0;	/*第一列的左右外边距都为10px,上外边距为20px*/	
			}
			#content .center{
				width: 700px;
				margin-top: 20px;
			}
			#content .right{
				width: 260px;
				margin: 20px 10px 0;
			}
			#bottom{
				width: 100%;
				height: 80px;
				background-color: gainsboro;
			}
		</style>
	</head>
	<body>
		<div id="top">头部</div>
		<div id="content">
			<div class="left common">第一列</div>
			<div class="center common">第二列</div>
			<div class="right common">第三列</div>
		</div>
		<div id="bottom">底部</div>
	</body>
</html>
